Universal Lens Cap Keeper. An elastic cord goes around your lens and a small circular stick-on piece goes on your lens cap to hold it so it can't fall! HeroFiber® Ultra Gentle Cleaning Cloth: HeroFiber® is the most efficient way to clean all optical surfaces. HeroFiber® acts like a magnet for dust, dirt, and oils, so it absorbs without being abrasive or leaving residue, and lasts considerably longer than ordinary cloths.